问题
选择题
While the police have already done a lot of investigation, much evidence ___ __.
A．is remaining to be confirmed
B．remained to be confirmed
C．is remained to be confirmed
D．remains to be confirmed
答案
答案：D
考查时态。句意：虽然警方已经做了大量调查，大量证据依然有待确定。可知remain这个动作从过去到现在，还没有结束，故用一般现在时态，选D。